1. The internal structure, API system OpenSCADA.
For the purpose of visual and affordable perception of the OpenSCADA system architecture in general the Figure 1 shows the static class diagram of OpenSCADA on the universal modeling language (UML). Based on the chart it is clear that the OpenSCADA system contains modular subsystems: «Archives», «Databases», «Transports», «Transport protocols», «User interfaces», «Data acquisition» and «Special», as well as subsystems: «Safety» and «Module's management». The chart graphically presents the relationship between modular subsystems and modules.
Fig. 1. The static class diagram